AIpro APSY1 Speed Healer Meter Error Correction Device "WR250R/X 3D7 XJR400R 4HM Fz400 4YR YZF-R6 2C0 13S YZF-R1 4XV 5JJ 5PW 5VY 4C8 XJR1300 DT230 4TP2" Sprocket replacement compatibleiPro Speed Healer APSY1 Corrects speed errors that occur when changing sprocket number combinations or changing tire size. Manufacturer: AIpro Part number: APSY1 Item weight: 90. 3 g Product size: 12 x 8 x 2 cm ; 90. 3 g Discontinued by the manufacturer: No Batteries included: No Batteries used: No Product dimensions (Length x Width x Height): 12 x 8 x 2cm